ADMICRO

Trends in worldwide energy use point up an urgent need to expedite the development of technology that can wean the world % from fossil fuels. Many experts contend that the recent increases in the price of oil will not be followed, as in the past, by an casing off after a year or two. Even if that were not the ease, the world would have to be concerned about inevitable constraints on supply. Gasoline and diesel engines in motor vehicles consume the (i) _______ majority of fossil fuel used outside power generation. The only technology currently in the pipeline for rescuing transportation from a very serious oil crunch is (ii)  _______ vehicles operating with hydrogen fuel-cell engines. Private industry, long a mere bystander in the development of the hydrogen economy, is now (iii) _______ the way to develop affordable and environmentally desirable hydrogen fuel-cell vehicles. The United States government is spending about $ 100 million per year for researeh on hydrogen vehicles and hydrogen-slorage technology. Major automobile manufactures claim they will have (iv) _______ hydrogen cars by 2015. These cars, it should be noted, will produce no greenhouse gases. Like any new fuel technology, hydrogen will require infrastructure. Plants to generate usable hydrogen, pipelines to move it, and depots in which to store it, must be put in place. Stations for refilling a vehicle’s hydrogen tank must be as common as ordinary gas stations before many consumers will venture onto the open road with hydrogen cars, yet this is not an unrealistic scenario. Most probably, existing oil and gasoline infrastructure can be affordably – and incrementally – (v) _______ to hydrogen infrastructure.

(i)_____-

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